TJie Relative Size of Red- Blood Corpuscle and Brain. 33 



The following table shows the greatest decrease in size of cor 

 piiscles in passing from tlie larger to the smaller animals. 



If more extensive examinations of mammals, birds, reptiles, 

 and fish were made concerning the size of their corpuscles and 

 brain, the results would be more satisfactory. 



Size of Red Corpuscle in fractions of an English inch. 



Elephant 2 Vis Whale ao'so 



Mare zi^b Beaver ziii, 



Guinea Pig 3 ^^ ^ Hare 3 1'g a 



Wolf aeV -0 Rabbit 3 g^ 7 



Mouse 3-6V4 Monkey 36'-24-3d'3 a 



Bear 3 e irs" Ass 4 ^ 



Tiger j-.'og Pig ^aVs 



Ox -4 -,'b ^ Lion ^g'a 2 



Red Deer ^^.^^ Cat 4 ^'o 4 



d3^^ 4 4*6 s '4 1 75 Horse 4 e o'b 



Sheep . 5 3'g i, Goat e a'a e 



Musk Deer ,^Jo^ 



In conclusion I would say that while the foregoing tables and 

 statements concerning the inverse ratio of the red corpuscles to the 

 brain, the brain to the body, the red corpuscle to the cerebellum, 

 also to force and activity, are not complete, yet they furnish evi- 

 dence sufficient to encourage further investigation, which will 

 sooner or later be pursued. I have endeavored to give the size of 

 the Corpuscle and weight of the brain, and, also as nearly as pos- 

 sible, the capacity and structure of the lung, the degree of temper- 

 ature, rate of respiration and circulation, the habits and develop- 

 ment of as many members as possible of each of the four classes of 

 vertebrates, that a more complete study might be made. 



We have found in passing from fish to mammals, that not only 

 does intelligence develop, but that circulation, respiration, diges- 

 tion and muscular structure are all likewise increased, and that the 

 brain becomes larger as does the cerebellum, while the red cor- 

 puscle grows smaller, as does the nerve tube or fibre, which varies 

 ,-g' 5 to e^'oo of an inch in diameter. 



